@article{Pearce_Swart_Lewis-Williams_Lombard_2021, title={The Harris Matrix and rock art; explanation and the Howieson’s Poort}, volume={18}, url={https://sahumanities.org/index.php/sah/article/view/252}, abstractNote={Comments and responses}, number={2}, journal={Southern African Humanities}, author={Pearce, D. G. and Swart, J. and Lewis-Williams, J. D. and Lombard, M.}, year={2021}, month={Feb.}, pages={173–88} }